Blue-Emitting Eu〔2+〕-Doped CaAl2O4 Phosphor Thin Films Prepared Using Pulsed Laser Deposition Technique with Post Annealing

  • Kunimoto Takashi
    Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
  • Kakehi Ken-nosuke
    Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
  • Yoshimatsu Ryo
    Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
  • Ohmi Koutoku
    Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
  • Tanaka Shosaku
    Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
  • Kobayashi Hiroshi
    Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680-8552, Japan

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タイトル別名
  • Blue-Emitting Eu2+-Doped CaAl2O4 Phosphor Thin Films Prepared Using Pulsed Laser Deposition Technique with Post Annealing.
  • Blue-Emitting Eu<sup>2+</sup>-Doped CaAl<sub>2</sub>O<sub>4</sub> Phosphor Thin Films Prepared Using Pulsed Laser Deposition Technique with Post Annealing

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抄録

Blue-emitting Eu2+-doped calcium aluminate phosphor thin films were obtained using the pulsed laser deposition technique with post annealing. As-deposited films were amorphous and showed weak red Eu3+ photoluminescence (PL). By annealing in reducing atmosphere (N2/H2:2% mixed gas) at 950°C for 3 h, the film was crystallized and showed a PL emission band peaking at about 447 nm, which originated from the 4f65d to 4f7 transition of Eu2+ ion. It is considered that the deposited film consists mainly of CaAl2O4 and partly of other binary compounds of the CaO-Al2O3 system. It was determined that the PL intensity of Eu2+ in CaAl2O4 can be controlled by the laser fluence, target-substrate distance and injection gas.

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